The IBCSO is the authoritative map of the Southern Ocean. It is based on billions of soundings contributed by organisations across the globe.
Version 2 of the IBCSO Grid was released in 2022 and is available to download from PANGAEA's web site. It has a resolution of 500 m × 500 m in a Polar Stereographic projection (EPSG: 9354). The total data coverage of the seafloor is 23.79% with a multibeam-only data coverage of 22.32%. The remaining 1.47% include singlebeam and other data. IBCSO v2 is the most authoritative seafloor map of the area south of 50°S.
Find out more from the release paper: Dorschel, B., Hehemann, L., Viquerat, S. et al. The International Bathymetric Chart of the Southern Ocean Version 2. Sci Data 9, 275 (2022). https://doi.org/10.1038/s41597-022-01366-7.
The Alfred Wegener Institute chairs the IBCSO and, in addition, is the Southern Ocean Regional Center for the Nippon Foundation-GEBCO Seabed 2030 Project.
Find out more about the IBCSO from their web site.